E. J. Callahan (Al Zebooker) is the same actor who plays the massage client who walks in with Phoebe's boss while she's starting to make out with Rick on her massage table in "The One with the Ballroom Dancing" (season 4, episode 4).
The red dinosaur toy Ross tries to get Rachel to give to Emma is one of the toys they bought in "The One with the Cooking Class" (S8E22)
In this episode, the Magna Doodle on Joey's apartment front door is a smiling banana holding a beach umbrella.
This episode contains two story lines that are similar to "The One with the Metaphorical Tunnel" from Season 3, Episode 4. In this, Ep. 1015, Phoebe impersonates and pretends to be Estelle, Joey's agent. In Ep. 304 - Joey is having problems with Estelle and asks Phoebe to step in for her, making Phoebe pretend to be an agent. In Ep.1015, there is a guest star by Maggie Wheeler as Janice and her and Chandler have an awkward encounter (as always). In Ep. 304, there is also a guest star by Maggie Wheeler as Janice where she and Chandler are dating and have trouble that leads to a break up.